communication
----
The starfish is the world's most brainless animal. It is literally without a brain and responds to its environment through nervous impulses running through its body. A lizard known as the horn toad is another example of an animal that has no functioning brain.
A cell responds to its environment by eating the waste of the animal (eats the food that the animal does not eat
These are structural. They're to do with an animal's structure. Behavioural means to do with how an animal behaves, or responds.
birds
The elephant
I think it is someone who is a Paramedic who responds to animal cases, like a very sick horse.
A Penguin.
Swine groups are called "sounders."
its territory
Typically when an animal flees, it travels.
he would stay the same